Combination paraffin scraper and rod guide



Dec. 4, 1956 P.- POLSON COMBINATION PARAFFIN SCRAPER AND ROD GUIDE Filed June 20. 1952 i 2W I Y /7 i2 I '1 In F1 4. 3 FIG. 4 4 0 Z P015022 IN V EN TOR.

A rro zusr This invention relates to oil well pumping equipment,

and it has particular reference to parafiin scrapers for preventing or minimizing the accumulation of parafiin deposits onthe inner surfaces of the well tubing during pumping operations, and its principal object resides in the provision of a device which effectively prevents static deposits of paraflin in the tubing'and affords an eflicient guide for sucker rods operating therein, a related device being disclosed in an abandoned application bearing Serial No. 140,003, filed by Paul Polson on January 23, 1950. I a

An object of the invention is that of providing a simple and economical structure which can be installed along the sucker rod at spaced intervals, as desired, and arranged thereon at different radial positions with respect to each other so as to insure the m'aximumtefliciency in operation.

Another object of the invention resides in the provision of a parafiin scraper and sucker rod guide having a minimum of parts which materially minimizes the cost of production of the device and affords a structure which is not readily destructible so as to become dislodged and fall into the well to impair the pump or in anywise hinder its operation.

A further object of the invention is manifest in the provision of a paraflin scraper and sucker rod guide which is formed so that its presence at a plurality of spacings along the sucker rod will not excessively restrict the flow of theoil products through the tubing and unnecessarily burden the pump operating mechanism with its weight.

Broadly, the invention contemplates the provision of a combination rod guide and paraffin scraper which can be so arranged and spaced along the rod as to efiectively scrape the inner surface of the tubing for the full extent of the pump stroke and prevent the rod from contacting the tubing wall.

While the foregoing objects are paramount, other and lesser objects will become manifest as the description proceeds, taken in connection with the appended drawings wherein:

Figure 1 illustrates the invention in elevation, showing one method of securing the same to a sucker rod, illustrated fragmentarily.

Figure 2 is another elevational view of the invention showing a different method of attachment to the rod.

Figure 3 is a plan view of the invention, as illustrated in Figure 1, showing a sleeve embracing the rod to which the scraper is welded.

Figure 4 is a plan view of the invention, as shown in Figure 2, in which a right-angular tab is formed with the shanks and turned about the rod. 7 I

Figure 5 is an elevational view of the invention formed with right-angular tabs on the outer ends of the shanks and installed in the manner shown in Figure 4, and

Figure 6 fragmentarily illustrates a typical installation United States Patent i 2,772,741 Patented Dec. 4, 1956 of a plurality of scrapers in a well tubing shown fragmentarily in vertical section. A

Accordingly, the invention comprises a tubular blade 10 which is adapted to be arranged upon a sucker rod 11 and concentrically thereof, as shown 'in .Figures 1 and :2, so that its opposing scraping edges 12 and 13 are oblique with respect to the axis of the tubular blade 1 0. It is desirable that the opposing scraping edges 12 and 13 be inclined in angle slightly greater than 45 degrees so 'jth'atthe upper edge 12on 'one side is 'below the lower edge 13 on the opposite side of the rod 11. By this arrangement there can be a greater overlapping of ,the

wiping or scraping action of the blade 10 than would be possible if the latter should be formed with the scraping edges in horizontal planes and provide for maximum fluid passage through the device. When a plurality of the units are spaced along the rod 11, and oriented to different rotative positions with respect to each other, the wiping operations of each unit will be overlapped by its adjacent units. V

. Formed integrally with the opposing edges 12 and 13 of the blade 10 are upper and lower shanks 14 and 15 which are inclined inwardly toward the rod 11 and have their outer ends 16 and 17 bent outwardly soas to lie against collars 18 and 19 arranged upon the rod 11 and to which the members 16 and 17 are welded. These members are arcuate in transverse section to conform to the surface of the rod 11, as illustrated in Figures 3 and 4 Y The collars 18 and 19 are C-shaped in plan, as shown in Figure 3, having a gap 20 therein and having a bevelled outer surface 21. The collars are formed on the rod 11 under relatively high pressure to insure rigidity. The outer ends 16 and 17 of the shanks 14 and 15 are welded along each longitudinal edge to the collars 18 and 19 over the gaps 20 therein, the collars thus absorbing the greater portion of the heat applied in the welding operation.

In Figures 2, 4 and '5 is illustrated a modified structure in which the shanks 14 and 15 have oppositely extending integral tabs 22 and 23 formed at right-angles thereto, as shown particularly in Figure 5. Otherwise the shanks 14 and 15 are identical with those shown in Figures 1 and 3. The shanks 14 and 15 are secured to the rod 11 by turning the tabs 22 and 23 thereabout so that the free ends thereof lap over a portion of the outer ends of the shanks 14 and 15 and welded thereto, in the manner shown in Figures 2 and 4. In this operation the rod 11 is also protected from the maximum welding heat, the greater portion of which is taken up by the shanks to which the tabs are secured.

The blades 10 are tubular in form and have their circumferential surfaces parallel to the axis of the rod 11 and conformable to the cylindrical inner surface of the tubing 24 in which they operate. The upper and lower edges 12 and 13 of the blade 10 are parallel to each other but are at an angle with respect to the axis of the blade. The external diameters of the blades 10 are slightly less than that of the tubing 24, in order to insure free movement therein, as these members maintain the concentric arrangement of the rod 11, and lubrication is provided by the oil flowing through the tubing 24.'

The scrapers can be. spaced along the rod 11 as desired and where needed, but it is practicable to space the blades 10 so that the wiping or scraping action of each will slightly overlap the adjacent members. This spacing would depend primarily upon the length of the stroke of the pump. The radial arrangement of the blades 10 about the rod 11 may also be varied to obtain the maximum results and insure proper scraping action.

Manifestly, the structure herein shown and described is capable of certain changes and modifications, from time to time, by persons skilled in the art without departing'from the spirit and intent of the invention or the scope of the appendedrclaims.

What is claimed is: r

1. In a paraffin scraper androd guide foroil .wells,

in combination with a sucker rod in .a wclltubi-ng, a tubularicircular element, the top and bottom edges of which are inclined to the vertical and parallel to each other, the saidelement being installed on said sucker rod in vconcentric relation thereto and having a diameter slightly less than that of said well tubing, a shank formed with each opposing edge 'of said tubular element and on opposite sides thereof, the said shanks being projected in opposite directions and inclinedinwardly toberigidly attached to said rod, and means forming parts'ot said shanks for securing the outer ends of said shanks to said rod. '2.lIn a paraffin scraper and sucker rod guide for oil wells, in combinationwith a sucker rod in an oil well tubing, a tubular cylindrical element adapted for installation at spaced intervals along and concentrically of said sucker rod, the said element having parallel top and bottom edges inclined to the vertical and having its wall parallel to the axis of said rod, a shank formed with each opposing edge and on each side of said element and inclined inwardly against said rod, and means embracing-said rod for rigidly securing the outer ends of said shanks thereto.

3. In a 'paraflin scraper and sucker rod guide for installation'at spaced intervals along and concentrically of a sucker rod within a well tubing, in combination with asucker-rod, a tubular cylindrical element, the top and bottom edges of which are parallel to each other and inclined to the vertical, and th side walls of which are parallel to the axis of said sucker rod, a supporting shank integral with "each edge and'on diametrically opposite sides of said element, the said shanks being inclined inwardly and having their outer ends lying against said rod, and means embracing said rod for securing the said shanks thereto.

4. In a parafiin scraper and sucker rod guide for installation at predetermined spacings along and concentrically of a sucker rod operating in a well tubing, in combination, a tubular cylindrical element, the top and bottom edges-of which are inclined to the vertical and parallel to each other, and'the side walls of which are parallel to the 1 axis of the sucker rod, and a pair of opposingly arranged shanks formed on opposite edges and onopposite sides of said element and inclined toward the axis thereof and against said rod providing means for securing said element thereto in concentric relation therewith.

5. in a combined paraffin scraper and sucker rod guide for installation in a well tubing at definite spacings along a sucker rod, the combination comprising a tubular circular element, the top and bottom edges of which are inclined to the vertical and parallel to each other, and the side walls of which are parallel to the axis of said rod, a shank formed with each opposing edge and at opposite sides of said element, the said shanks being inclined toward the axis of said element providing means for rigidly supporting the same concentrically on a sucker rod.

References Cited in the file of this patent UNITED- STATES PATENTS 1,891,615 Bostic Dec. 20, 1932 2,058,331 Long Oct. 20, 1936 2,354,245 Corbosiero July 25, 1944 2,595,025 Trippleh'orn -a Apr. 29, 1952 

